Learn how to defuse C4 bombs from Peter Stillman

Disorient an enemy with a cloud of smoke from a fire extinguisher

Get caught by Otacon stimulating yourself

Defeat Olga Gurlukovich

Loot 20 ship convoys

Clear the game in 25 minutes or less in "Hardcore" mode.

Clear the game as the Ronin.

Clear the game without dying in "Hardcore" mode.

Complete all "Perfect" challenges.

Defeat Shiro in 25 seconds or less.

Complete all "Collector" challenges.

Obtain a gold medal in "Boss Rush" mode.

Get the best ending.